With the improved prognosis of human immunodeficiency virus (HIV) infection, end stage liver disease due to hepatitis C (HCV) now represents a major cause of morbidity and mortality in people with HIV. Treatment for HCV has become increasingly important as a means of preventing the consequences of chronic HCV infection. Paradoxically, co-infected patients have low rates of treatment initiation and completion in large part because they have a high risk of developing neuropsychiatric symptoms while receiving PEG-interferon (PEG-IFN). There are a large number of co-infected individuals in Canada who could benefit from HCV therapy if tolerability could be improved. This trial will address whether prophylactic use of antidepressants in HIV-HCV infected patients initiating HCV therapy can prevent the development of neuropsychiatric side effects and thus permit more patients to receive full treatment for HCV.